Wave-shaped bristles are made with fine nylon, to suit teeth topography for thorough cleaning of gums and hard to reach areas. Powerful cleaning through 40,000 micro brushes per minute -leave you feeling like just coming off the dentist's chair Removes up to 100% more plaque than a regular handheld toothbrush. Three Weeks Working and 2 Minutes Automatic Timer: The power electric toothbrush can last up to about four weeks after a full 12 hours charge, Built-in 2 minutes tooth brushing timer automatic brushing cycle with interval pause reminding per 30 seconds to develop good dentist-recommended brushing habit. Automatic shutdown 2 minutes later. Replace the toothbrush head every 3 months to avoid excessive breeding of bacteria as recommended by dentists.